Bolt, who has won 17 gold medals in the Olympics and World Championships, surprised the young fitness guru with an appearance on the US talk show.

While Bolt is largely considered the coolest athlete on the planet, Smith showed some swagger of his own, leaving little doubt that he thought he could trump the sprint king.

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Too good: Demarjay Smith leaves Usain Bolt in his wake.Credit:YouTube

"C'mon Usain don't be scared of me," the trash talking Smith told Bolt before the race.

As the pair headed for a photo finish, Bolt pulled up lame with a phantom torn hammie, as Smith leaps over the finish line in gold medal position. The out of breath champ then declared: "I want a rematch".

If that was not enough for the already star-stuck Smith, Bolt then presented him with some athletics gear.

It has been an indifferent week for Bolt, who is in preparations to defend his track crowns at the Rio Olympics.

Cool as a cucumber: Demarjay Smith.Credit:YouTube

The avid Manchester United fan posted a photograph on Instagram of him wearing an Arsenal jersey after losing a bet with glamorous Mexican TV presenter Patty Lopez dela Cerda.

Bolt has floated the idea of possibly retiring after next years Olympics.